Adjustable bed



FIG. 1 is a perspective view of a deck-on-deck adjustable bed design in a first position; and,

FIG. 2 is a side perspective view of the design of FIG. 1 in the first position.

The broken lines are for environmental purposes only and form no part of the claimed design. 

CLAIM I claim the ornamental design for an adjustable bed, as shown and described. 